Question

Derive an expression for equivalent internal resistance of n number of cells connected in parallel.​

Answer 1

Cells connected in parallel

V = V (B1) - V (B2) = ε1- I1 r1. The point B1 and B2 are connected similar to the second cell. If we replace the cells by a single cell lying between the point B1 and B2 with emf εeq and internal resistance req, then V = εeq - Ireq.

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Answer 2

Explanation:

The equivalent internal resistance of n cells in series combination is the sum of their individual internal resistance.

In series combination if the current leaves the cell from the negative electrode, the emf of the cell will be for example

VBC = - ε2 – Ir2 and finally the equation for εeq = ε1 - ε2, (ε1 > ε2)